<span>log ₂ 7 х log ₇4 </span><span>= log ₂ 7 х log ₇2²=2 log ₂ 7 х log ₇2= </span>
<span>2 log ₂ 7/ log ₂ 7=2</span>
3^8 * 7 ^10= 21^18
21^18 : 21 ^ 7 = 21^11
X^2 - 4x + 3 = 0 ;
D = 16 - 12 = 4 ; V D = 2 ;
X1 = ( 4 + 2 ) : 2 = 3 ;
X2 = ( 4 - 2 ) : 2 = 1
1 < 3 ; Ответ при Х = 1